I've noticed on some Sychrowave 210 machines, the box at the lower left on the control knob is blank, and others it is the setting for MIG.
Are these two separate machines, or can I buy the "standard" 210 and add MIG to it later? or do you have to buy the TIG/MIG COMPLETE package to get MIG?

Will be off the the LWS later this week, but wanted to have a clue.